package com.wc.blue_bridge_history.Java14C.D_平均;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.StringTokenizer;

/**
 * @Author congge
 * @Date 2024/3/28 9:50
 * @description https://www.lanqiao.cn/paper/3873/problem/3532/
 */
public class Main {
    static FastReader sc = new FastReader();
    static PrintWriter out = new PrintWriter(System.out);
    static int N = 100010;
    static int[][] a = new int[10][N];
    static int x, val;
    static int n;

    public static void main(String[] args) {
        n = sc.nextInt();
        // 每个需要多少个
        int r = n / 10;
        for (int i = 1; i <= n; i++) {
            x = sc.nextInt();
            val = sc.nextInt();
            a[x][++a[x][0]] = val;
        }
        long res = 0;
        for (int i = 0; i <= 9; i++) {
            if (a[i][0] > r) {
                Arrays.sort(a[i], 1, a[i][0] + 1);
                for (int j = 1; j <= a[i][0] - r; j++) {
                    res += a[i][j];
                }
            }
        }
        out.println(res);
        out.flush();
    }
}

class FastReader {
    StringTokenizer st;
    BufferedReader br;

    FastReader() {
        br = new BufferedReader(new InputStreamReader(System.in));
    }

    String next() {
        while (st == null || !st.hasMoreElements()) {
            try {
                st = new StringTokenizer(br.readLine());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return st.nextToken();
    }

    int nextInt() {
        return Integer.parseInt(next());
    }

    String nextLine() {
        String s = "";
        try {
            s = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return s;
    }

    long nextLong() {
        return Long.parseLong(next());
    }

    double nextDouble() {
        return Double.parseDouble(next());
    }

    // 是否由下一个
    boolean hasNext() {
        while (st == null || !st.hasMoreTokens()) {
            try {
                String line = br.readLine();
                if (line == null)
                    return false;
                st = new StringTokenizer(line);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return true;
    }
}
